/*
 * http://www.JSON.org/json2.js 2008-07-15
 * 
 * Public Domain.
 * 
 * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
 * 
 * See http://www.JSON.org/js.html
 * 
 * This file creates a global JSON object containing two methods: stringify and
 * parse.
 * 
 * JSON.stringify(value, replacer, space) value any JavaScript value, usually an
 * object or array.
 * 
 * replacer an optional parameter that determines how object values are
 * stringified for objects. It can be a function or an array.
 * 
 * space an optional parameter that specifies the indentation of nested
 * structures. If it is omitted, the text will be packed without extra
 * whitespace. If it is a number, it will specify the number of spaces to indent
 * at each level. If it is a string (such as '\t' or '&nbsp;'), it contains the
 * characters used to indent at each level.
 * 
 * This method produces a JSON text from a JavaScript value.
 * 
 * When an object value is found, if the object contains a toJSON method, its
 * toJSON method will be called and the result will be stringified. A toJSON
 * method does not serialize: it returns the value represented by the name/value
 * pair that should be serialized, or undefined if nothing should be serialized.
 * The toJSON method will be passed the key associated with the value, and this
 * will be bound to the object holding the key.
 * 
 * For example, this would serialize Dates as ISO strings.
 * 
 * Date.prototype.toJSON = function (key) { function f(n) { // Format integers
 * to have at least two digits. return n < 10 ? '0' + n : n; }
 * 
 * return this.getUTCFullYear() + '-' + f(this.getUTCMonth() + 1) + '-' +
 * f(this.getUTCDate()) + 'T' + f(this.getUTCHours()) + ':' +
 * f(this.getUTCMinutes()) + ':' + f(this.getUTCSeconds()) + 'Z'; };
 * 
 * You can provide an optional replacer method. It will be passed the key and
 * value of each member, with this bound to the containing object. The value
 * that is returned from your method will be serialized. If your method returns
 * undefined, then the member will be excluded from the serialization.
 * 
 * If the replacer parameter is an array, then it will be used to select the
 * members to be serialized. It filters the results such that only members with
 * keys listed in the replacer array are stringified.
 * 
 * Values that do not have JSON representations, such as undefined or functions,
 * will not be serialized. Such values in objects will be dropped; in arrays
 * they will be replaced with null. You can use a replacer function to replace
 * those with JSON values. JSON.stringify(undefined) returns undefined.
 * 
 * The optional space parameter produces a stringification of the value that is
 * filled with line breaks and indentation to make it easier to read.
 * 
 * If the space parameter is a non-empty string, then that string will be used
 * for indentation. If the space parameter is a number, then the indentation
 * will be that many spaces.
 * 
 * Example:
 * 
 * text = JSON.stringify(['e', {pluribus: 'unum'}]); // text is
 * '["e",{"pluribus":"unum"}]'
 * 
 * 
 * text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); // text is
 * '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
 * 
 * text = JSON.stringify([new Date()], function (key, value) { return this[key]
 * instanceof Date ? 'Date(' + this[key] + ')' : value; }); // text is
 * '["Date(---current time---)"]'
 * 
 * 
 * JSON.parse(text, reviver) This method parses a JSON text to produce an object
 * or array. It can throw a SyntaxError exception.
 * 
 * The optional reviver parameter is a function that can filter and transform
 * the results. It receives each of the keys and values, and its return value is
 * used instead of the original value. If it returns what it received, then the
 * structure is not modified. If it returns undefined then the member is
 * deleted.
 * 
 * Example:
 *  // Parse the text. Values that look like ISO date strings will // be
 * converted to Date objects.
 * 
 * myData = JSON.parse(text, function (key, value) { var a; if (typeof value ===
 * 'string') { a =
 * /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
 * if (a) { return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], +a[5],
 * +a[6])); } } return value; });
 * 
 * myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { var d; if
 * (typeof value === 'string' && value.slice(0, 5) === 'Date(' &&
 * value.slice(-1) === ')') { d = new Date(value.slice(5, -1)); if (d) { return
 * d; } } return value; });
 * 
 * 
 * This is a reference implementation. You are free to copy, modify, or
 * redistribute.
 * 
 * This code should be minified before deployment. See
 * http://javascript.crockford.com/jsmin.html
 * 
 * USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
 * NOT CONTROL.
 */

/* jslint evil: true */

/* global JSON */

/*
 * members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", call, charCodeAt,
 * getUTCDate, getUTCFullYear, getUTCHours, getUTCMinutes, getUTCMonth,
 * getUTCSeconds, hasOwnProperty, join, lastIndex, length, parse,
 * propertyIsEnumerable, prototype, push, replace, slice, stringify, test,
 * toJSON, toString
 */

if (!this.JSON) {

	// Create a JSON object only if one does not already exist. We create the
	// object in a closure to avoid creating global variables.

	JSON = function() {

		function f(n) {
			// Format integers to have at least two digits.
			return n < 10 ? '0' + n : n;
		}

		Date.prototype.toJSON = function(key) {

			return this.getUTCFullYear() + '-' + f(this.getUTCMonth() + 1) + '-' + f(this.getUTCDate()) + 'T' + f(this.getUTCHours()) + ':' + f(this.getUTCMinutes()) + ':' + f(this.getUTCSeconds()) + 'Z';
		};

		String.prototype.toJSON = Number.prototype.toJSON = Boolean.prototype.toJSON = function(key) {
			return this.valueOf();
		};

		var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, escapeable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, gap, indent, meta = { // table
																																																																							// of
																																																																							// character
																																																																							// substitutions
			'\b' : '\\b',
			'\t' : '\\t',
			'\n' : '\\n',
			'\f' : '\\f',
			'\r' : '\\r',
			'"' : '\\"',
			'\\' : '\\\\'
		}, rep;

		function quote(string) {

			// If the string contains no control characters, no quote
			// characters, and no
			// backslash characters, then we can safely slap some quotes around
			// it.
			// Otherwise we must also replace the offending characters with safe
			// escape
			// sequences.

			escapeable.lastIndex = 0;
			return escapeable.test(string) ? '"' + string.replace(escapeable, function(a) {
				var c = meta[a];
				if (typeof c === 'string') {
					return c;
				}
				return '\\u' + ('0000' + (+(a.charCodeAt(0))).toString(16)).slice(-4);
			}) + '"' : '"' + string + '"';
		}

		function str(key, holder) {

			// Produce a string from holder[key].

			var i, // The loop counter.
			k, // The member key.
			v, // The member value.
			length, mind = gap, partial, value = holder[key];

			// If the value has a toJSON method, call it to obtain a replacement
			// value.

			if (value && typeof value === 'object' && typeof value.toJSON === 'function') {
				value = value.toJSON(key);
			}

			// If we were called with a replacer function, then call the
			// replacer to
			// obtain a replacement value.

			if (typeof rep === 'function') {
				value = rep.call(holder, key, value);
			}

			// What happens next depends on the value's type.

			switch (typeof value) {
				case 'string' :
					return quote(value);

				case 'number' :

					// JSON numbers must be finite. Encode non-finite numbers as
					// null.

					return isFinite(value) ? String(value) : 'null';

				case 'boolean' :
				case 'null' :

					// If the value is a boolean or null, convert it to a
					// string. Note:
					// typeof null does not produce 'null'. The case is included
					// here in
					// the remote chance that this gets fixed someday.

					return String(value);

					// If the type is 'object', we might be dealing with an
					// object or an array or
					// null.

				case 'object' :

					// Due to a specification blunder in ECMAScript, typeof null
					// is 'object',
					// so watch out for that case.

					if (!value) {
						return 'null';
					}

					// Make an array to hold the partial results of stringifying
					// this object value.

					gap += indent;
					partial = [];

					// If the object has a dontEnum length property, we'll treat
					// it as an array.

					if (typeof value.length === 'number' && !(value.propertyIsEnumerable('length'))) {

						// The object is an array. Stringify every element. Use
						// null as a placeholder
						// for non-JSON values.

						length = value.length;
						for (i = 0; i < length; i += 1) {
							partial[i] = str(i, value) || 'null';
						}

						// Join all of the elements together, separated with
						// commas, and wrap them in
						// brackets.

						v = partial.length === 0 ? '[]' : gap ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' : '[' + partial.join(',') + ']';
						gap = mind;
						return v;
					}

					// If the replacer is an array, use it to select the members
					// to be stringified.

					if (rep && typeof rep === 'object') {
						length = rep.length;
						for (i = 0; i < length; i += 1) {
							k = rep[i];
							if (typeof k === 'string') {
								v = str(k, value);
								if (v) {
									partial.push(quote(k) + (gap ? ': ' : ':') + v);
								}
							}
						}
					} else {

						// Otherwise, iterate through all of the keys in the
						// object.

						for (k in value) {
							if (Object.hasOwnProperty.call(value, k)) {
								v = str(k, value);
								if (v) {
									partial.push(quote(k) + (gap ? ': ' : ':') + v);
								}
							}
						}
					}

					// Join all of the member texts together, separated with
					// commas,
					// and wrap them in braces.

					v = partial.length === 0 ? '{}' : gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' : '{' + partial.join(',') + '}';
					gap = mind;
					return v;
			}
		}

		// Return the JSON object containing the stringify and parse methods.

		return {
			stringify : function(value, replacer, space) {

				// The stringify method takes a value and an optional replacer,
				// and an optional
				// space parameter, and returns a JSON text. The replacer can be
				// a function
				// that can replace values, or an array of strings that will
				// select the keys.
				// A default replacer method can be provided. Use of the space
				// parameter can
				// produce text that is more easily readable.

				var i;
				gap = '';
				indent = '';

				// If the space parameter is a number, make an indent string
				// containing that
				// many spaces.

				if (typeof space === 'number') {
					for (i = 0; i < space; i += 1) {
						indent += ' ';
					}

					// If the space parameter is a string, it will be used as
					// the indent string.

				} else if (typeof space === 'string') {
					indent = space;
				}

				// If there is a replacer, it must be a function or an array.
				// Otherwise, throw an error.

				rep = replacer;
				if (replacer && typeof replacer !== 'function' && (typeof replacer !== 'object' || typeof replacer.length !== 'number')) {
					throw new Error('JSON.stringify');
				}

				// Make a fake root object containing our value under the key of
				// ''.
				// Return the result of stringifying the value.

				return str('', {
					'' : value
				});
			},

			parse : function(text, reviver) {

				// The parse method takes a text and an optional reviver
				// function, and returns
				// a JavaScript value if the text is a valid JSON text.

				var j;

				function walk(holder, key) {

					// The walk method is used to recursively walk the resulting
					// structure so
					// that modifications can be made.

					var k, v, value = holder[key];
					if (value && typeof value === 'object') {
						for (k in value) {
							if (Object.hasOwnProperty.call(value, k)) {
								v = walk(value, k);
								if (v !== undefined) {
									value[k] = v;
								} else {
									delete value[k];
								}
							}
						}
					}
					return reviver.call(holder, key, value);
				}

				// Parsing happens in four stages. In the first stage, we
				// replace certain
				// Unicode characters with escape sequences. JavaScript handles
				// many characters
				// incorrectly, either silently deleting them, or treating them
				// as line endings.

				cx.lastIndex = 0;
				if (cx.test(text)) {
					text = text.replace(cx, function(a) {
						return '\\u' + ('0000' + (+(a.charCodeAt(0))).toString(16)).slice(-4);
					});
				}

				// In the second stage, we run the text against regular
				// expressions that look
				// for non-JSON patterns. We are especially concerned with '()'
				// and 'new'
				// because they can cause invocation, and '=' because it can
				// cause mutation.
				// But just to be safe, we want to reject all unexpected forms.

				// We split the second stage into 4 regexp operations in order
				// to work around
				// crippling inefficiencies in IE's and Safari's regexp engines.
				// First we
				// replace the JSON backslash pairs with '@' (a non-JSON
				// character). Second, we
				// replace all simple value tokens with ']' characters. Third,
				// we delete all
				// open brackets that follow a colon or comma or that begin the
				// text. Finally,
				// we look to see that the remaining characters are only
				// whitespace or ']' or
				// ',' or ':' or '{' or '}'. If that is so, then the text is
				// safe for eval.

				if (/^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

					// In the third stage we use the eval function to compile
					// the text into a
					// JavaScript structure. The '{' operator is subject to a
					// syntactic ambiguity
					// in JavaScript: it can begin a block or an object literal.
					// We wrap the text
					// in parens to eliminate the ambiguity.

					j = eval('(' + text + ')');

					// In the optional fourth stage, we recursively walk the new
					// structure, passing
					// each name/value pair to a reviver function for possible
					// transformation.

					return typeof reviver === 'function' ? walk({
						'' : j
					}, '') : j;
				}

				// If the text is not JSON parseable, then a SyntaxError is
				// thrown.

				throw new SyntaxError('JSON.parse');
			}
		};
	}();
}
